/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

#if JUCE_ENABLE_LIVE_CONSTANT_EDITOR

namespace juce::LiveConstantEditor
{

//==============================================================================
class AllComponentRepainter final : private Timer,
                                    private DeletedAtShutdown
{
public:
    AllComponentRepainter()  {}
    ~AllComponentRepainter() override  { clearSingletonInstance(); }

    JUCE_DECLARE_SINGLETON (AllComponentRepainter, false)

    void trigger()
    {
        if (! isTimerRunning())
            startTimer (100);
    }

private:
    void timerCallback() override
    {
        stopTimer();

        Array<Component*> alreadyDone;

        for (int i = TopLevelWindow::getNumTopLevelWindows(); --i >= 0;)
            if (auto* c = TopLevelWindow::getTopLevelWindow (i))
                repaintAndResizeAllComps (c, alreadyDone);

        auto& desktop = Desktop::getInstance();

        for (int i = desktop.getNumComponents(); --i >= 0;)
            if (auto* c = desktop.getComponent (i))
                repaintAndResizeAllComps (c, alreadyDone);
    }

    static void repaintAndResizeAllComps (Component::SafePointer<Component> c,
                                          Array<Component*>& alreadyDone)
    {
        if (c->isVisible() && ! alreadyDone.contains (c))
        {
            c->repaint();
            c->resized();

            for (int i = c->getNumChildComponents(); --i >= 0;)
            {
                if (auto* child = c->getChildComponent (i))
                {
                    repaintAndResizeAllComps (child, alreadyDone);
                    alreadyDone.add (child);
                }

                if (c == nullptr)
                    break;
            }
        }
    }
};

JUCE_IMPLEMENT_SINGLETON (AllComponentRepainter)
JUCE_IMPLEMENT_SINGLETON (ValueList)

//==============================================================================
int64 parseInt (String s)
{
    s = s.trimStart();

    if (s.startsWithChar ('-'))
        return -parseInt (s.substring (1));

    if (s.startsWith ("0x"))
        return s.substring (2).getHexValue64();

    return s.getLargeIntValue();
}

double parseDouble (const String& s)
{
    return s.retainCharacters ("0123456789.eE-").getDoubleValue();
}

String intToString (int   v, bool preferHex)    { return preferHex ? "0x" + String::toHexString (v) : String (v); }
String intToString (int64 v, bool preferHex)    { return preferHex ? "0x" + String::toHexString (v) : String (v); }

//==============================================================================
LiveValueBase::LiveValueBase (const char* file, int line)
    : sourceFile (file), sourceLine (line)
{
    name = File (sourceFile).getFileName() + " : " + String (sourceLine);
}

LiveValueBase::~LiveValueBase()
{
}

//==============================================================================
LivePropertyEditorBase::LivePropertyEditorBase (LiveValueBase& v, CodeDocument& d)
    : value (v), document (d), sourceEditor (document, &tokeniser)
{
    setSize (600, 100);

    addAndMakeVisible (name);
    addAndMakeVisible (resetButton);
    addAndMakeVisible (valueEditor);
    addAndMakeVisible (sourceEditor);

    findOriginalValueInCode();
    selectOriginalValue();

    name.setFont (withDefaultMetrics (FontOptions { 13.0f }));
    name.setText (v.name, dontSendNotification);
    valueEditor.setMultiLine (v.isString());
    valueEditor.setReturnKeyStartsNewLine (v.isString());
    valueEditor.setText (v.getStringValue (wasHex), dontSendNotification);
    valueEditor.onTextChange = [this] { applyNewValue (valueEditor.getText()); };
    sourceEditor.setReadOnly (true);
    sourceEditor.setFont (sourceEditor.getFont().withHeight (13.0f));
    resetButton.onClick = [this] { applyNewValue (value.getOriginalStringValue (wasHex)); };
}

void LivePropertyEditorBase::paint (Graphics& g)
{
    g.setColour (Colours::white);
    g.fillRect (getLocalBounds().removeFromBottom (1));
}

void LivePropertyEditorBase::resized()
{
    auto r = getLocalBounds().reduced (0, 3).withTrimmedBottom (1);

    auto left = r.removeFromLeft (jmax (200, r.getWidth() / 3));

    auto top = left.removeFromTop (25);
    resetButton.setBounds (top.removeFromRight (35).reduced (0, 3));
    name.setBounds (top);

    if (customComp != nullptr)
    {
        valueEditor.setBounds (left.removeFromTop (25));
        left.removeFromTop (2);
        customComp->setBounds (left);
    }
    else
    {
        valueEditor.setBounds (left);
    }

    r.removeFromLeft (4);
    sourceEditor.setBounds (r);
}

void LivePropertyEditorBase::applyNewValue (const String& s)
{
    value.setStringValue (s);

    document.replaceSection (valueStart.getPosition(), valueEnd.getPosition(), value.getCodeValue (wasHex));
    document.clearUndoHistory();
    selectOriginalValue();

    valueEditor.setText (s, dontSendNotification);
    AllComponentRepainter::getInstance()->trigger();
}

void LivePropertyEditorBase::selectOriginalValue()
{
    sourceEditor.selectRegion (valueStart, valueEnd);
}

void LivePropertyEditorBase::findOriginalValueInCode()
{
    CodeDocument::Position pos (document, value.sourceLine, 0);
    auto line = pos.getLineText();
    auto p = line.getCharPointer();

    p = CharacterFunctions::find (p, CharPointer_ASCII ("JUCE_LIVE_CONSTANT"));

    if (p.isEmpty())
    {
        // Not sure how this would happen - some kind of mix-up between source code and line numbers..
        jassertfalse;
        return;
    }

    p += (int) (sizeof ("JUCE_LIVE_CONSTANT") - 1);
    p.incrementToEndOfWhitespace();

    if (! CharacterFunctions::find (p, CharPointer_ASCII ("JUCE_LIVE_CONSTANT")).isEmpty())
    {
        // Aargh! You've added two JUCE_LIVE_CONSTANT macros on the same line!
        // They're identified by their line number, so you must make sure each
        // one goes on a separate line!
        jassertfalse;
    }

    if (p.getAndAdvance() == '(')
    {
        auto start = p, end = p;

        int depth = 1;

        while (! end.isEmpty())
        {
            auto c = end.getAndAdvance();

            if (c == '(')  ++depth;
            if (c == ')')  --depth;

            if (depth == 0)
            {
                --end;
                break;
            }
        }

        if (end > start)
        {
            valueStart = CodeDocument::Position (document, value.sourceLine, (int) (start - line.getCharPointer()));
            valueEnd   = CodeDocument::Position (document, value.sourceLine, (int) (end   - line.getCharPointer()));

            valueStart.setPositionMaintained (true);
            valueEnd.setPositionMaintained (true);

            wasHex = String (start, end).containsIgnoreCase ("0x");
        }
    }
}

//==============================================================================
class ValueListHolderComponent final : public Component
{
public:
    ValueListHolderComponent (ValueList& l) : valueList (l)
    {
        setVisible (true);
    }

    void addItem (int width, LiveValueBase& v, CodeDocument& doc)
    {
        addAndMakeVisible (editors.add (v.createPropertyComponent (doc)));
        layout (width);
    }

    void layout (int width)
    {
        setSize (width, editors.size() * itemHeight);
        resized();
    }

    void resized() override
    {
        auto r = getLocalBounds().reduced (2, 0);

        for (int i = 0; i < editors.size(); ++i)
            editors.getUnchecked (i)->setBounds (r.removeFromTop (itemHeight));
    }

    enum { itemHeight = 120 };

    ValueList& valueList;
    OwnedArray<LivePropertyEditorBase> editors;
};

//==============================================================================
class ValueList::EditorWindow final : public DocumentWindow,
                                      private DeletedAtShutdown
{
public:
    EditorWindow (ValueList& list)
        : DocumentWindow ("Live Values", Colours::lightgrey, DocumentWindow::closeButton)
    {
        setLookAndFeel (&lookAndFeel);
        setUsingNativeTitleBar (true);

        viewport.setViewedComponent (new ValueListHolderComponent (list), true);
        viewport.setSize (700, 600);
        viewport.setScrollBarsShown (true, false);

        setContentNonOwned (&viewport, true);
        setResizable (true, false);
        setResizeLimits (500, 400, 10000, 10000);
        centreWithSize (getWidth(), getHeight());
        setVisible (true);
    }

    ~EditorWindow() override
    {
        setLookAndFeel (nullptr);
    }

    void closeButtonPressed() override
    {
        setVisible (false);
    }

    void updateItems (ValueList& list)
    {
        if (auto* l = dynamic_cast<ValueListHolderComponent*> (viewport.getViewedComponent()))
        {
            while (l->getNumChildComponents() < list.values.size())
            {
                if (auto* v = list.values [l->getNumChildComponents()])
                    l->addItem (viewport.getMaximumVisibleWidth(), *v, list.getDocument (v->sourceFile));
                else
                    break;
            }

            setVisible (true);
        }
    }

    void resized() override
    {
        DocumentWindow::resized();

        if (auto* l = dynamic_cast<ValueListHolderComponent*> (viewport.getViewedComponent()))
            l->layout (viewport.getMaximumVisibleWidth());
    }

    Viewport viewport;
    LookAndFeel_V3 lookAndFeel;
};

//==============================================================================
ValueList::ValueList()  {}
ValueList::~ValueList() { clearSingletonInstance(); }

void ValueList::addValue (LiveValueBase* v)
{
    values.add (v);
    triggerAsyncUpdate();
}

void ValueList::handleAsyncUpdate()
{
    if (editorWindow == nullptr)
        editorWindow = new EditorWindow (*this);

    editorWindow->updateItems (*this);
}

CodeDocument& ValueList::getDocument (const File& file)
{
    const int index = documentFiles.indexOf (file.getFullPathName());

    if (index >= 0)
        return *documents.getUnchecked (index);

    auto* doc = documents.add (new CodeDocument());
    documentFiles.add (file);
    doc->replaceAllContent (file.loadFileAsString());
    doc->clearUndoHistory();
    return *doc;
}

//==============================================================================
struct ColourEditorComp final : public Component,
                                private ChangeListener
{
    ColourEditorComp (LivePropertyEditorBase& e)  : editor (e)
    {
        setMouseCursor (MouseCursor::PointingHandCursor);
    }

    Colour getColour() const
    {
        return Colour ((uint32) parseInt (editor.value.getStringValue (false)));
    }

    void paint (Graphics& g) override
    {
        g.fillCheckerBoard (getLocalBounds().toFloat(), 6.0f, 6.0f,
                            Colour (0xffdddddd).overlaidWith (getColour()),
                            Colour (0xffffffff).overlaidWith (getColour()));
    }

    void mouseDown (const MouseEvent&) override
    {
        auto colourSelector = std::make_unique<ColourSelector>();
        colourSelector->setName ("Colour");
        colourSelector->setCurrentColour (getColour());
        colourSelector->addChangeListener (this);
        colourSelector->setColour (ColourSelector::backgroundColourId, Colours::transparentBlack);
        colourSelector->setSize (300, 400);

        CallOutBox::launchAsynchronously (std::move (colourSelector), getScreenBounds(), nullptr);
    }

    void changeListenerCallback (ChangeBroadcaster* source) override
    {
        if (auto* cs = dynamic_cast<ColourSelector*> (source))
            editor.applyNewValue (getAsString (cs->getCurrentColour(), true));

        repaint();
    }

    LivePropertyEditorBase& editor;
};

Component* createColourEditor (LivePropertyEditorBase& editor)
{
    return new ColourEditorComp (editor);
}

//==============================================================================
struct SliderComp : public Component
{
    SliderComp (LivePropertyEditorBase& e, bool useFloat)
        : editor (e), isFloat (useFloat)
    {
        slider.setTextBoxStyle (Slider::NoTextBox, true, 0, 0);
        addAndMakeVisible (slider);
        updateRange();
        slider.onDragEnd = [this] { updateRange(); };
        slider.onValueChange = [this]
        {
            editor.applyNewValue (isFloat ? getAsString ((double) slider.getValue(), editor.wasHex)
                                          : getAsString ((int64)  slider.getValue(), editor.wasHex));
        };
    }

    virtual void updateRange()
    {
        double v = isFloat ? parseDouble (editor.value.getStringValue (false))
                           : (double) parseInt (editor.value.getStringValue (false));

        double range = isFloat ? 10 : 100;

        slider.setRange (v - range, v + range);
        slider.setValue (v, dontSendNotification);
    }

    void resized() override
    {
        slider.setBounds (getLocalBounds().removeFromTop (25));
    }

    LivePropertyEditorBase& editor;
    Slider slider;
    bool isFloat;
};

//==============================================================================
struct BoolSliderComp final : public SliderComp
{
    BoolSliderComp (LivePropertyEditorBase& e)
        : SliderComp (e, false)
    {
        slider.onValueChange = [this] { editor.applyNewValue (slider.getValue() > 0.5 ? "true" : "false"); };
    }

    void updateRange() override
    {
        slider.setRange (0.0, 1.0, dontSendNotification);
        slider.setValue (editor.value.getStringValue (false) == "true", dontSendNotification);
    }
};

Component* createIntegerSlider (LivePropertyEditorBase& editor)  { return new SliderComp (editor, false); }
Component* createFloatSlider   (LivePropertyEditorBase& editor)  { return new SliderComp (editor, true);  }
Component* createBoolSlider    (LivePropertyEditorBase& editor)  { return new BoolSliderComp (editor); }

} // namespace juce::LiveConstantEditor

#endif
